50đ giúp mk hết nhé dúng nhất nha VI. Read the text and answer the questions. How can we keep our teeth healthy? First, we ought to visit our dentist twice a year. He can fill a small holes in your teeth. He can examine our teeth before they destroy the teeth. He can examine our teeth to check that they are growing in the right way. Unfortunately, many people wait until they have toothache before they see a dentist. Secondly, we should brush our teeth with a tooth brush and fluoride tooth paste at least twice a day, once after breakfast and once before we go to bed. We can also use wooden toothpicks to clean beetween our teeth after a meal. Thirdly we should eat food that is good for our teeth and our body: milk, cheese, fish, brown bread, potatoes, red rice, raw vegetables and fresh fruit. Chocolates, sweets, biscuits and cakes are bad, especially when we eat them between meals. They are harmful because they stick to our teeth and cause decay. 36. Only when do a lot of people visit a dentist? _________________________________________________________ 37. How often should we try to clean our teeth? _________________________________________________________ 38. What shouldn’t we eat a lot? _________________________________________________________ 39. Why are sweets harmful? _________________________________________________________ 40. How many advices are there in the passage? _________________________________________________________ VII. Rewrite the sentences using the words given. (2.5p) 41. Peter started to collect stamps two years ago. (for) _________________________________________________________ 42. I read books evey day. I want to widen my knowledge, (so) _________________________________________________________ 43. I have never studied Japanese before, (first) _________________________________________________________ 44. It last rained three weeks ago. (since) _________________________________________________________ 45. He has played football for five years, (ago) _________________________________________________________